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    <article class="post">
        <header>
            <h1 class="post-title">Flutterer中的可拖动浮动操作按钮</h1>
        </header>
        <date class="post-meta meta-date">
            2021年8月15日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/Flutter'>Flutter</a></span>
            
        </div>
        
        
        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
        </div>
        
        
        <div class="post-content">
            <p><strong>lutter</strong>允许您使用 FloatingActionButton 小部件添加浮动操作按钮。尽管如此，它不允许您拖动按钮。考虑您需要使其可拖动的可能性。这篇文章有一个模型，它揭示了你需要做什么来制作一个浮动的动作按钮，只要它在父小部件内，就可以在屏幕周围的任何地方拖拽。</p>
<p>在在这篇博客中，我们将探索<strong>Flutter 中</strong>的<strong>Draggable Floating Action Button</strong>。 我们将看到如何实现可拖动浮动操作按钮的演示程序，并展示如何在您的 Flutter 应用程序中创建它。</p>
<p>[TOC]</p>
<h1 id="介绍">介绍：</h1>
<p>下面的演示视频展示了如何在 flutter 中创建可拖动的浮动操作按钮。它展示了可拖动的浮动操作按钮如何在您的 Flutter 应用程序中工作。它显示代码何时成功运行，然后用户将浮动操作按钮拖动到屏幕周围的任何位置，只要它在父小部件内即可。它将显示在您的设备上。</p>
<blockquote>
<p><em>演示模块：</em></p>
</blockquote>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/freeze/max/26/1*r_zdnL6TD64krL8XrfY_FA.gif?q=20">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/freeze/max/26/1*r_zdnL6TD64krL8XrfY_FA.gif?q=20" />
        </a>
    </p>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/max/621/1*r_zdnL6TD64krL8XrfY_FA.gif">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/max/621/1*r_zdnL6TD64krL8XrfY_FA.gif" />
        </a>
    </p>
<h1 id="如何在-dart-文件中实现代码">如何在 dart 文件中实现代码：</h1>
<p>您需要分别在您的代码中实现它：</p>
<blockquote>
<p><code>*main.dart*</code><em>在<strong>文件夹</strong>内**创建一个新的 dart 文件</em><code>*lib*</code><em>。</em></p>
</blockquote>
<p>首先，我们将创建一个 Globalkey 并将其命名为 _parentKey</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">final</span> GlobalKey _parentKey <span style="color:#f92672">=</span> GlobalKey();
</code></pre></div><p>在正文中，我们将添加一个具有高度和宽度的 Container 小部件。这是子属性，我们将添加 Stack 小部件。在这个小部件中，我们将添加一个键、文本和一个<strong>DraggableFloatingActionButton()</strong>。在按钮内部，我们将添加一个具有高度和宽度的容器。在其子属性上添加图像。此外，我们将添加 initialOffset、父键和 onPressed。我们将深入定义下面的代码。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">Container(
  width: <span style="color:#ae81ff">300</span>,
  height: <span style="color:#ae81ff">300</span>,
  child: Stack(
    key: _parentKey,
    children: [
      Container(color: Colors.cyan),
      Center(
        child: <span style="color:#66d9ef">const</span> Text(
          <span style="color:#e6db74">&#34;FlutterDev&#39;s.com&#34;</span>,
          style: <span style="color:#66d9ef">const</span> TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">24</span>),
        ),
      ),
      DraggableFloatingActionButton(
        child: Container(
          width: <span style="color:#ae81ff">60</span>,
          height: <span style="color:#ae81ff">60</span>,
          decoration: ShapeDecoration(
            shape: CircleBorder(),
            color: Colors.white,
          ),
          child: Image.asset(<span style="color:#e6db74">&#34;assets/logo.png&#34;</span>),
        ),
        initialOffset: <span style="color:#66d9ef">const</span> Offset(<span style="color:#ae81ff">120</span>, <span style="color:#ae81ff">70</span>),
        parentKey: _parentKey,
        onPressed: () {},
      ),
    ],
  ),
)
</code></pre></div><blockquote>
<p><code>*draggable_floating_action_button.dart*</code><em>在<strong>文件夹</strong>内**创建一个新的 dart 文件</em><code>*lib*</code><em>。</em></p>
</blockquote>
<p>我们将为这样的小部件创建一个类。我们需要处理的主要事情是使按钮在指针之后可拖动的能力。可以使用的小部件之一是侦听器，它可以识别指针移动事件并提供移动细节。本质上，按钮应该被包装为 Listener 的孩子。</p>
<p>该<code>Listener</code>具有<code>onPointerMove</code>可被利用来传递当指针移动，这将被认为是一个回呼的争用。回调函数应该有一个边界 PointerMoveEvent，它包含 x 和 y 标题(delta.dx 和 delta.dy)中的发展增量。捕获的偏移量应由移动增量刷新。</p>
<p>以下是用于制作可拖动浮动操作按钮的类。它有一些包含<code>child</code>、initialOffset 和 onPressed 的争用。该<code>child</code>部件交付利用被定位小部件依赖于电流偏移。它另外包装为 Listener 小部件的子级。还有一个策略 _updatePosition 可以根据移动增量刷新当前偏移量。</p>
<pre><code>class DraggableFloatingActionButton extends StatefulWidget {

  final Widget child;
  final Offset initialOffset;
  final VoidCallback onPressed;

  DraggableFloatingActionButton({
    required this.child,
    required this.initialOffset,
    required this.onPressed,
  });

  @override
  State&lt;StatefulWidget&gt; createState() =&gt; _DraggableFloatingActionButtonState();
}

class _DraggableFloatingActionButtonState extends State&lt;DraggableFloatingActionButton&gt; {

  bool _isDragging = false;
  late Offset _offset;

  @override
  void initState() {
    super.initState();
    _offset = widget.initialOffset;
  }

  void _updatePosition(PointerMoveEvent pointerMoveEvent) {
    double newOffsetX = _offset.dx + pointerMoveEvent.delta.dx;
    double newOffsetY = _offset.dy + pointerMoveEvent.delta.dy;

    setState(() {
      _offset = Offset(newOffsetX, newOffsetY);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Positioned(
      left: _offset.dx,
      top: _offset.dy,
      child: Listener(
        onPointerMove: (PointerMoveEvent pointerMoveEvent) {
          _updatePosition(pointerMoveEvent);

          setState(() {
            _isDragging = true;
          });
        },
        onPointerUp: (PointerUpEvent pointerUpEvent) {
          print('onPointerUp');

          if (_isDragging) {
            setState(() {
              _isDragging = false;
            });
          } else {
            widget.onPressed();
          }
        },
        child: widget.child,
      ),
    );
  }
}
</code></pre><p>您需要向父小部件添加一个键并将其传递给<code>DraggableFloatingActionButton</code>小部件。从key中，可以从<code>currentContext</code>property中获取RenderBox，其中有findRenderObject一个策略。然后，此时，您可以从 RenderBox 的 size 属性中获取父级的大小。您应该小心，因为应该在构建树之后调用 findRenderObject 技术。随后，您需要使用 WidgetsBinding 的 addPostFrameCallback 来召唤它。</p>
<p>该<code>_updatePosition</code>技术应该被改变了。如果新偏移量低于最小偏移量，则必须将该值设置为最小偏移量。如果新偏移量比最大偏移量更值得注意，则必须将该值设置为最大的最大偏移量。您需要对 x 轴和 y 轴执行此操作。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">DraggableFloatingActionButton</span> <span style="color:#66d9ef">extends</span> StatefulWidget {

  <span style="color:#66d9ef">final</span> Widget child;
  <span style="color:#66d9ef">final</span> Offset initialOffset;
  <span style="color:#66d9ef">final</span> VoidCallback onPressed;

  DraggableFloatingActionButton({
    required <span style="color:#66d9ef">this</span>.child,
    required <span style="color:#66d9ef">this</span>.initialOffset,
    required <span style="color:#66d9ef">this</span>.onPressed,
  });

  <span style="color:#960050;background-color:#1e0010">@</span>override
  State<span style="color:#f92672">&lt;</span>StatefulWidget<span style="color:#f92672">&gt;</span> createState() <span style="color:#f92672">=&gt;</span> _DraggableFloatingActionButtonState();
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">_DraggableFloatingActionButtonState</span> <span style="color:#66d9ef">extends</span> State<span style="color:#f92672">&lt;</span>DraggableFloatingActionButton<span style="color:#f92672">&gt;</span> {

  <span style="color:#66d9ef">final</span> GlobalKey _key <span style="color:#f92672">=</span> GlobalKey();

  <span style="color:#66d9ef">bool</span> _isDragging <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
  late Offset _offset;
  late Offset _minOffset;
  late Offset _maxOffset;

  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">void</span> initState() {
    <span style="color:#66d9ef">super</span>.initState();
    _offset <span style="color:#f92672">=</span> widget.initialOffset;

    WidgetsBinding.instance<span style="color:#f92672">?</span>.addPostFrameCallback(_setBoundary);
  }

  <span style="color:#66d9ef">void</span> _setBoundary(_) {
    <span style="color:#66d9ef">final</span> RenderBox parentRenderBox <span style="color:#f92672">=</span> widget.parentKey.currentContext<span style="color:#f92672">?</span>.findRenderObject() <span style="color:#f92672">as</span> RenderBox;
    <span style="color:#66d9ef">final</span> RenderBox renderBox <span style="color:#f92672">=</span> _key.currentContext<span style="color:#f92672">?</span>.findRenderObject() <span style="color:#f92672">as</span> RenderBox;

    <span style="color:#66d9ef">try</span> {
      <span style="color:#66d9ef">final</span> Size parentSize <span style="color:#f92672">=</span> parentRenderBox.size;
      <span style="color:#66d9ef">final</span> Size size <span style="color:#f92672">=</span> renderBox.size;

      setState(() {
        _minOffset <span style="color:#f92672">=</span> <span style="color:#66d9ef">const</span> Offset(<span style="color:#ae81ff">0</span>, <span style="color:#ae81ff">0</span>);
        _maxOffset <span style="color:#f92672">=</span> Offset(
            parentSize.width <span style="color:#f92672">-</span> size.width,
            parentSize.height <span style="color:#f92672">-</span> size.height
        );
      });
    } <span style="color:#66d9ef">catch</span> (e) {
      print(<span style="color:#e6db74">&#39;catch: </span><span style="color:#e6db74">$</span>e<span style="color:#e6db74">&#39;</span>);
    }
  }

  <span style="color:#66d9ef">void</span> _updatePosition(PointerMoveEvent pointerMoveEvent) {
    <span style="color:#66d9ef">double</span> newOffsetX <span style="color:#f92672">=</span> _offset.dx <span style="color:#f92672">+</span> pointerMoveEvent.delta.dx;
    <span style="color:#66d9ef">double</span> newOffsetY <span style="color:#f92672">=</span> _offset.dy <span style="color:#f92672">+</span> pointerMoveEvent.delta.dy;

    <span style="color:#66d9ef">if</span> (newOffsetX <span style="color:#f92672">&lt;</span> _minOffset.dx) {
      newOffsetX <span style="color:#f92672">=</span> _minOffset.dx;
    } <span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span> (newOffsetX <span style="color:#f92672">&gt;</span> _maxOffset.dx) {
      newOffsetX <span style="color:#f92672">=</span> _maxOffset.dx;
    }

    <span style="color:#66d9ef">if</span> (newOffsetY <span style="color:#f92672">&lt;</span> _minOffset.dy) {
      newOffsetY <span style="color:#f92672">=</span> _minOffset.dy;
    } <span style="color:#66d9ef">else</span> <span style="color:#66d9ef">if</span> (newOffsetY <span style="color:#f92672">&gt;</span> _maxOffset.dy) {
      newOffsetY <span style="color:#f92672">=</span> _maxOffset.dy;
    }

    setState(() {
      _offset <span style="color:#f92672">=</span> Offset(newOffsetX, newOffsetY);
    });
  }

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> Positioned(
      left: _offset.dx,
      top: _offset.dy,
      child: Listener(
        onPointerMove: (PointerMoveEvent pointerMoveEvent) {
          _updatePosition(pointerMoveEvent);

          setState(() {
            _isDragging <span style="color:#f92672">=</span> <span style="color:#66d9ef">true</span>;
          });
        },
        onPointerUp: (PointerUpEvent pointerUpEvent) {
          print(<span style="color:#e6db74">&#39;onPointerUp&#39;</span>);

          <span style="color:#66d9ef">if</span> (_isDragging) {
            setState(() {
              _isDragging <span style="color:#f92672">=</span> <span style="color:#66d9ef">false</span>;
            });
          } <span style="color:#66d9ef">else</span> {
            widget.onPressed();
          }
        },
        child: Container(
          key: _key,
          child: widget.child,
        ),
      ),
    );
  }
}
</code></pre></div><blockquote>
<p><em>当我们运行应用程序时，我们应该像下面的屏幕截图一样获得屏幕的输出。</em></p>
</blockquote>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/max/26/1*VSwNFRmAMl67U98uxYdbOg.png?q=20">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/max/26/1*VSwNFRmAMl67U98uxYdbOg.png?q=20" />
        </a>
    </p>
<p>
        <a data-fancybox="gallery" href="https://miro.medium.com/max/700/1*VSwNFRmAMl67U98uxYdbOg.png">
            <img class="mx-auto" alt="img" src="https://miro.medium.com/max/700/1*VSwNFRmAMl67U98uxYdbOg.png" />
        </a>
    </p>
<p>最终输出</p>
<h1 id="代码文件">代码文件：</h1>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/cupertino.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter/material.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter_draggable_floating/draggable_floating_action_button.dart&#39;</span>;
<span style="color:#66d9ef">import</span> <span style="color:#e6db74">&#39;package:flutter_draggable_floating/splash_screen.dart&#39;</span>;

<span style="color:#66d9ef">void</span> main() <span style="color:#f92672">=&gt;</span> runApp(MyApp());

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">MyApp</span> <span style="color:#66d9ef">extends</span> StatelessWidget {

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> MaterialApp(
      debugShowCheckedModeBanner: <span style="color:#66d9ef">false</span>,
      home: Splash(),
    );
  }
}

<span style="color:#66d9ef">class</span> <span style="color:#a6e22e">DraggableFloatingActionButtonDemo</span> <span style="color:#66d9ef">extends</span> StatelessWidget {

  <span style="color:#66d9ef">final</span> GlobalKey _parentKey <span style="color:#f92672">=</span> GlobalKey();

  <span style="color:#960050;background-color:#1e0010">@</span>override
  Widget build(BuildContext context) {
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> Scaffold(
      appBar: AppBar(
        automaticallyImplyLeading: <span style="color:#66d9ef">false</span>,
        title: <span style="color:#66d9ef">const</span> Text(<span style="color:#e6db74">&#39;Flutter Draggable Floating Action Button&#39;</span>),
        backgroundColor: Colors.cyan,
      ),
      body: Column(
        children: [
          Container(
            height: <span style="color:#ae81ff">150</span>,
          ),
          Container(
            width: <span style="color:#ae81ff">300</span>,
            height: <span style="color:#ae81ff">300</span>,
            child: Stack(
              key: _parentKey,
              children: [
                Container(color: Colors.cyan),
                Center(
                  child: <span style="color:#66d9ef">const</span> Text(
                    <span style="color:#e6db74">&#34;FlutterDev&#39;s.com&#34;</span>,
                    style: <span style="color:#66d9ef">const</span> TextStyle(color: Colors.white, fontSize: <span style="color:#ae81ff">24</span>),
                  ),
                ),
                DraggableFloatingActionButton(
                  child: Container(
                    width: <span style="color:#ae81ff">60</span>,
                    height: <span style="color:#ae81ff">60</span>,
                    decoration: ShapeDecoration(
                      shape: CircleBorder(),
                      color: Colors.white,
                    ),
                    child: Image.asset(<span style="color:#e6db74">&#34;assets/logo.png&#34;</span>),
                  ),
                  initialOffset: <span style="color:#66d9ef">const</span> Offset(<span style="color:#ae81ff">120</span>, <span style="color:#ae81ff">70</span>),
                  parentKey: _parentKey,
                  onPressed: () {},
                ),
              ],
            ),
          )
        ],
      ),
    );
  }
}
</code></pre></div><h1 id="结论">结论：</h1>
<p>在文章中，我已经在flutter中讲解了Draggable Floating Action Button的基本结构；您可以根据自己的选择修改此代码。这是 我对用户交互时的可拖动浮动操作按钮的一个小介绍，我正在使用 Flutter。</p>
<p>我希望这个博客将为您提供足够的信息，试图达到 的<strong>可拖动的浮动操作按钮</strong>在你的flutter项目**。**我们将向您展示介绍是什么？这就是在 Flutter 中制作可拖动的浮动操作按钮的方法。从根本上说，您可以利用 Listener 小部件来区分指针移动事件并根据开发增量更新按钮偏移量。Listener 小部件同样支持区分指针向上事件，按钮的活动应该在这些事件上执行，除非它最近被拖动。您同样需要获取父级和按钮的大小，以防止按钮脱离父级的框。所以请尝试一下。</p>
<p>❤❤感谢阅读本文❤❤</p>

        </div>

        
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        <li><strong>原文作者：</strong><a rel="author" href="https://luckly.work/">luckly</a></li>
        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/Flutter/Flutterer%E4%B8%AD%E7%9A%84%E5%8F%AF%E6%8B%96%E5%8A%A8%E6%B5%AE%E5%8A%A8%E6%93%8D%E4%BD%9C%E6%8C%89%E9%92%AE/">https://luckly.work/post/Flutter/Flutterer%E4%B8%AD%E7%9A%84%E5%8F%AF%E6%8B%96%E5%8A%A8%E6%B5%AE%E5%8A%A8%E6%93%8D%E4%BD%9C%E6%8C%89%E9%92%AE/</a></li>
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